Hi there mate, adding to what I was saying earlier, this video was made a few years back but it beautifully highlights the issues with Nasri in the no.10 role. I would say he's improved on his final ball though he still likes to go for the overly tricky passes but it's mainly his positional instincts and his tendency to run into the box that he gets wrong. Take a look and then next match he plays the role, you'll know exactly what to look for. All throughout that Sunderland match his best work(key passes etc) were out wide and he constantly drifted out there, rather than staying as a reference point, a pivot point in offense if you will, for his team mates.